#include<bits/stdc++.h>
using namespace std;

class Solution {
public:
    int findLUSlength(string a, string b) {
        return (a == b) ? -1 : max(a.length(), b.length());
    }
};

/**
 * @brief 
 * 2022.3.5
 * 辣鸡智力题
 */